Thermal Power Plant Performance Analysis by Estimating Boiler Efficiency via Indirect Method: A Case Study

Year 2024, Volume: 13 Issue: 3, 587 - 600, 26.09.2024

Pınar Celen , Hasan Hüseyin Erdem

https://doi.org/10.17798/bitlisfen.1459622

Abstract

The performance of power plants is very critical since it is directly related with operating and electricity production costs. Among the other different type of power plants, coal-fired ones have advantages such as reliability and low cost fuel. In this paper, a coal (lignite) fired thermal power plant having capacity of 160 MW is taken into consideration and the impact of condenser pressure, moisture content of lignite, excess air coefficient, efficiency of turbine pressure and heater numbers on power plant thermal efficiency is investigated. It is aimed to determine performance losses of each equipment by means of the thermodynamics and economic analysis. In this scope, it is expected that the power plant operator will be able to evaluate the reduction potential of equipment performance losses and ensure more effective use of the power plants by correctly planning the maintenance and rehabilitation needs and times. In the calculations, the boiler efficiency was determined with EN 12952-15 standard (indirect method) since this method has higher accuracy in coal fired boilers. It is seen that the condenser pressure and excess air coefficient increments have not significant impact on power plant efficiency compared to moisture content of lignite, excess air coefficient, efficiency of turbine pressure and heater numbers. The significant effect is observed for fuel moisture content which rises from 22% to 47% and the power plant efficiency falls from 40% to 28%. The variation of the power plant thermal efficiency in case of failure of heaters is investigated and the power plant efficiency has decreased from 40.17% to 36.09% when the pre-heaters are no longer in to be in use because of any reason. In addition, revenue losses are estimated for each main equipment efficiency reduction for better use of power plant capacities and electricity lowering production costs.

Keywords

Power plant performance, Boiler efficiency, Revenue loss, Thermodynamics analysis, Coal-fired power plant

Ethical Statement

The study is complied with research and publication ethics.

References

• [1] H. H. Erdem et al., “Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey,” Int. J. Therm. Sci., vol. 48, no. 11, pp. 2179–2186, 2009, doi: https://doi.org/10.1016/j.ijthermalsci.2009.03.007.
• [2] M. H. Ahmadi et al., “Thermodynamic and economic analysis of performance evaluation of all the thermal power plants: A review,” Energy Sci. Eng., vol. 7, no. 1, pp. 30–65, 2019, doi: https://doi.org/10.1002/ese3.223.
• [3] S. C. Kaushik, V. S. Reddy, and S. K. Tyagi, “Energy and exergy analyses of thermal power plants: A review,” Renew. Sustain. Energy Rev., vol. 15, no. 4, pp. 1857–1872, 2011, doi: https://doi.org/10.1016/j.rser.2010.12.007.
• [4] O. J. Khaleel, T. K. Ibrahim, F. B. Ismail, and A. T. Al-Sammarraie, “Developing an analytical model to predict the energy and exergy based performances of a coal-fired thermal power plant,” Case Stud. Therm. Eng., vol. 28, pp. 1-20, 2021, doi: https://doi.org/10.1016/j.csite.2021.101519
• [5] S. Kumar, D. Kumar, R. A. Memon, M. A. Wassan, and S. A. Mir, “Energy and exergy analysis of a coal fired power plant,” Mehran Univ. Res. J. Eng. Technol., vol. 37, no. 4, pp. 611–624, 2018, doi: https://doi.org/10.22581/muet1982.1804.13
• [6] M. N. Eke, D. C. Onyejekwe, O. C. Iloeje, C. I. Ezekwe, and P. U. Akpan, “Energy and exergy evaluation of a 220MW thermal power plant,” Niger. J. Technol., vol. 37, no. 1, p. 115, 2018, doi: https://doi.org/10.4314/njt.v37i1.15.
• [7] P. Regulagadda, I. Dincer, and G. F. Naterer, “Exergy analysis of a thermal power plant with measured boiler and turbine losses,” Appl. Therm. Eng., vol. 30, no. 8–9, pp. 970–976, 2010, doi: https://doi.org/10.1016/j.applthermaleng.2010.01.008.
• [8] M. Tontu, B. Sahin, and M. Bilgili, “Using energy and exergy analysis to compare different coal-fired power plants,” Energy Sources Recovery Util. Environ. Eff., pp. 1–16, 2019, doi: https://doi.org/10.1080/15567036.2019.1696429.
• [9] K. F. See and T. Coelli, “An analysis of factors that influence the technical efficiency of Malaysian thermal power plants,” Energy Econ., vol. 34, no. 3, pp. 677–685, 2012, doi: https://doi.org/10.1016/j.eneco.2011.09.005.
• [10] G. R. Ahmadi and D. Toghraie, “Energy and exergy analysis of Montazeri Steam Power Plant in Iran,” Renew. Sustain. Energy Rev., vol. 56, pp. 454–463, 2016, doi; https://doi.org/10.1016/j.rser.2015.11.074.
• [11] J. Oman, A. Senegačnik, and B. Dejanovič, “Influence of lignite composition on thermal power plant performance,” Energy Convers. Manag., vol. 42, no. 3, pp. 251–263, 2001, doi; https://doi.org/10.1016/S0196-8904(00)00062-5.
• [12] T. Ganapathy et al., “Exergy analysis of operating lignite fired thermal power plant,” J. Eng. Sci. Technol. Rev., vol. 2, no. 1, pp. 123–130, 2009, doi: https://doi.org/10.25103/jestr.021.23
• [13] A. Geete and A. I. Khandwawala, “Thermodynamic analysis of 120MW thermal power plant with combined effect of constant inlet pressure (127.06 bar) and different condenser back pressures,” IUP J. Mech. Eng., vol. 7, no. 1, pp. 25-46, 2014.
• [14] A. Geete and A. I. Khandwawala, “Thermodynamic analysis of 120MW thermal power plant with combined effect of constant inlet pressure (124.61 bar) and different inlet temperatures,” Case Stud. Therm. Eng., vol. 1, no. 1, pp. 17–25, 2013, doi; https://doi.org/10.1016/j.csite.2013.08.001.
• [15] A. Vosough, A Falahat, and S. Vosough, “Improvement power plant efficiency with condenser pressure,” Int. J Multidiscip. Sci. Eng., vol. 2, no. 3, pp. 38–43, Jan. 2011.
• [16] Y. Huang, J. T. McMullan, and B. C. Williams “Influences of coal type on the performance of a pressurised fluidised bed combustion power plant,” Fuel, vol. 79, no. 13, pp. 1595–1601, 2000, doi; https://doi.org/10.1016/S0016-2361(00)00022-3.
• [17] Engineering Equation Solver (EES), F-Chart Software, Middleton, WI, ABD.
• [18] European Standards, EN 12952-1Water-tube boilers and auxiliary installations - Part 1: General (2001).
• [19] T. C. Elektrik Üretim Anonim Şirketi (EÜAŞ), “18 Mart Çan Termik Santrali,” [Çevrimiçi]. Erişilebilir: https://www.euas.gov.tr/santraller/18-mart-can. [Erişim: 20-May-2023].
• [20] Z. Oktay, “Investigation of coal-fired power plants in Turkey and a case study: Can plant,” Appl. Therm. Eng., vol. 29, no. 2–3, pp. 550–557, 2009, doi; https://doi.org/10.1016/j.applthermaleng.2008.03.025.
• [21] T. C. Elektrik Üretim Anonim Şirketi (EÜAŞ), Yıllık Rapor 2021, Türkiye.